Valve-gear for engines.



No. 787,228. PATENTED APR.11, 1905. 0. SOHWADE.

VALVE GEAR FOR ENGINES.

APPLICATION FILED DEO.12, 1904.

UNTTTD STATES Patented April 11, 1905.

PATENT OFFICE,

VALVE GEAR FOR ENGINES.

SPECIFICATION forming part of Letters Patent No. 787,223, dated April 11, 1905.

Application filed December 12, 1904. Serial No. 236,571.

."o /r// 1/71/0111 it 12ml, coll/earl Be it known that l, O'r'ro SCHWADE, a subject of the King of Prussia, Emperor of (iermany, residing at Erfu rt, Germany, have invented certain new and useful Improvements in or Relating to Valve-(Tear for Engines, of which the following is a specilication.

The valve-gear according to this invention for doul le-cylinder steam-engines without a fly-wheel. with pistons guided so as to move in a straight line, comprises rotary bodies for the movement of the valves arranged in the valve-chest and completely debarred from longitudinal movement and operated by the valverods.

lu the drawings, Figure l is a side elevation in longitudinal section. Fig. 2 is a sectional plan, and Fig. 1% is a transverse section looking to the rear.

in the construction illustrated by way of example in the accompanying drawings the PlSLOH-I'UtlH of a double-cylinder engine are connected by arms to valve-rods l. which therefore make the same stroke as the pistonrods. ln the valve-chest (l rotary bodies I are arranged in such manner that they are prevented from making longitudinal movement. Each of these rotary bodies 1* is tubular and is rotated by its valve-rod c, owing to the latter being provided with an outside lug, wm'm-threznl, or spiral rib f, with which a col'respomling inner worm-thread or groove 1/ in the rotary body engages. The rotation of the body v is transmitted to the valve /r, which, for instance, may be a D or other valve. The rotary body of one cylinder operates the valve of the other cylinder. \Vherc the valve-chests are parallel to the line of movement of the pistons, spiral ribs, such as f or portions of such ribs on the rotary bodies, produce the movement of the valves /L when the rotary bodies 1/ are turned. If, however, the movement of the valves takes place at a right angle to the movement of the pistons, cams on the rotary bodies take the place of the outer spiral ribs.

This valve-gear has the advantage that all those parts which are usually arranged outside and are subject to wear are dispensed with,

and consequently there is no longer any need 1 to look after them or to lubricate them. The parts, which are all arranged in the interior of the valve-chest, are sutliciently lubricated by the oil-saturated steam, so that a saving in lubricating material is also effected. The valve-rods are accurately guided throughout the whole of their travel in the rotary bodies, and there are no bolts, screws, or nuts in the valve-chest liable to work loose.

The rotation of the rotary bodies according to this invention could also be effected by securing them to their valve-rods and preventing them in the manner described from longitudinal movement and turning both together by providing worm-grooves in the tubular ends of the arms 6, with which engage corresponding ribs or threads on the valve-rods c. In this valve-gear also the nmnber of loose parts is reduced to a minimum, as also is the weight of the moving parts of the valve-gear. All large sliding surfaces in the valve-chest are avoided, and in that way the dimensions of the valve-chest may be reduced to a minimum.

If desired, the rotary body can itself be formed as a piston valvc or connected to a piston-valve directly.

hat I claim as my invention, and desire to secure by Letters Patent, is

l. Valve-operating gear for two-cylinder steam'engincs comprising a valve-chest, two rotary non reciprocable valve operating bodies in said valve-chest and spiral-screw means for rotating said bodies: substantially as set forth.

Valve-operating gear for two-cylinder steam-engines comprising a valve-chest, two rotary non-reciprocable valve-operating tubular bodies, valverods within said tubular bodies and spiral-screw connections between the valve-rods and their tubular bodies: substantially as set forth.

3. Valve-operating gear for two-cylinder stea111-engines comprising a valve-chest, two rotary non reciprocable valve operating bodies in said chest, means for rotating said bodies, and projections on said bodies for operating the valve: substantially as set forth.

-l. Valve-operating gear for two-cylinder steam-engines comprising a valve-chest, two

rotary non reciprocable valve operating bodies in said chest, means for rotating said bodies, and spiral projections on said bodies for operating the valve: substantially as set forth.

5. Valve-operating gear for two-cylinder steam-engines comprising a valve-chest, tWo rotary non-reciprocable valve-operating tubular bodies, valverods Within said tubular bodies, a spiral groove in each of said tubular bodies, and acorresponding spiral projection on each valve-rod: substantially as set forth.

6. Valve-operating gear for two-cylinder steam-engines comprising a valve-chest, tW0 rotary non-reciprocable val ve-operating tubular bodies, valve-rods Within said tubular bodies, a spiral groove in each of said tubular bodies, a corresponding spiral projection on each valve-rod and a valve-operating projec- OTTO SCHVVADE.

Witnesses:

PAUL TEICHMANN, J. Y. PARTEL o. 

